iOS 获取高速随机路径sandbox目录

NSLog(@"%@", NSHomeDirectory());//沙盒主目录
NSLog(@"%@", NSTemporaryDirectory());//砂箱tmp目录路径
NSLog(@"%@", [[NSBundle mainBundle] bundlePath]);//砂箱*.app路径包
NSLog(@"%@", [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject]);//砂箱document目录路径